Is ARSB p.Ser403Ter (c.1208C>A) pathogenic?

ARSB p.Ser403Ter (c.1208C>A) is classified Pathogenic in ARSB (ClinVar, Single submitter, 1 submitter; last evaluated 2023-09-21). Absent from gnomAD v4.1; Associated with mucopolysaccharidosis type 6.

What condition is associated with ARSB p.Ser403Ter (c.1208C>A)?

ARSB p.Ser403Ter (c.1208C>A) is associated with mucopolysaccharidosis type 6 (ClinVar).

How common is ARSB p.Ser403Ter (c.1208C>A) in the general population?

ARSB p.Ser403Ter (c.1208C>A) is absent from gnomAD v4.1 (gnomAD).

How is Mucopolysaccharidosis type 6 inherited?

Typically Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

ARSB p.Ser403Ter

c.1208C>A · rs771296632 · VCV1323935

Pathogenic Single submitter

Classification

Pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

Consequence

nonsense (stop-gain)

predicted LoF

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

mucopolysaccharidosis type 6

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	nonsense (stop-gain)	predicted loss-of-function; NMD-escape possible for C-terminal truncations
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 9.9	GERP 1.8, phastCons 1
Overall
CADD	37.0	PHRED · no single calibrated threshold — expert panels disagree

Predicted loss-of-function is descriptive, not an applied PVS1 code.

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: ARSB
Protein: p.Ser403Ter
Coding: c.1208C>A
MANE Select: NM_020427 · reported on NM_000046
dbSNP: rs771296632
Type: single nucleotide variant
Location: chr5:78839361 (GRCh38)
Structure: AlphaFold pLDDT 84.32 · 2 PDB

Full ARSB gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

mucopolysaccharidosis type 6 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Mucopolysaccharidosis type 6 (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood
Prevalence: 1-9 / 1 000 000 (Europe)

Similar variants

ARSB p.Ser403Leu Uncertain significance ★★ ⚠ same residue
ARSB p.Ser403= Likely benign ★ same residue
ARSB p.Ser403fs Pathogenic ★ same residue
ARSB c.1142+1G>A Pathogenic ★★ same condition
ARSB c.1142+1G>T Pathogenic ★★ same condition
ARSB c.1142+2T>A Pathogenic/Likely pathogenic ★★ same condition
ARSB c.1142+2T>C Pathogenic ★★ same condition
ARSB c.1143-1G>A Pathogenic/Likely pathogenic ★★ same condition

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/arsb-p-ser403ter (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown